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[/] [or1k/] [trunk/] [rtems-20020807/] [cpukit/] [librpc/] [src/] [xdr/] [xdr_reference.c] - Blame information for rev 1765

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1 1026 ivang
/*
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 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
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 * unrestricted use provided that this legend is included on all tape
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 * media and as a part of the software program in whole or part.  Users
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 * may copy or modify Sun RPC without charge, but are not authorized
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 * to license or distribute it to anyone else except as part of a product or
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 * program developed by the user.
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 *
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 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
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 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
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 *
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 * Sun RPC is provided with no support and without any obligation on the
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 * part of Sun Microsystems, Inc. to assist in its use, correction,
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 * modification or enhancement.
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 *
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 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
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 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
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 * OR ANY PART THEREOF.
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 *
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 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
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 * or profits or other special, indirect and consequential damages, even if
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 * Sun has been advised of the possibility of such damages.
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 *
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 * Sun Microsystems, Inc.
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 * 2550 Garcia Avenue
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 * Mountain View, California  94043
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 */
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#if defined(LIBC_SCCS) && !defined(lint)
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/*static char *sccsid = "from: @(#)xdr_reference.c 1.11 87/08/11 SMI";*/
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/*static char *sccsid = "from: @(#)xdr_reference.c      2.1 88/07/29 4.0 RPCSRC";*/
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static char *rcsid = "$FreeBSD: src/lib/libc/xdr/xdr_reference.c,v 1.8 1999/08/28 00:02:56 peter Exp $";
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#endif
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/*
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 * xdr_reference.c, Generic XDR routines impelmentation.
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 *
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 * Copyright (C) 1987, Sun Microsystems, Inc.
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 *
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 * These are the "non-trivial" xdr primitives used to serialize and de-serialize
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 * "pointers".  See xdr.h for more info on the interface to xdr.
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <rpc/types.h>
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#include <rpc/xdr.h>
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#define LASTUNSIGNED ((u_int) 0-1)
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/*
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 * XDR an indirect pointer
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 * xdr_reference is for recursively translating a structure that is
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 * referenced by a pointer inside the structure that is currently being
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 * translated.  pp references a pointer to storage. If *pp is null
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 * the  necessary storage is allocated.
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 * size is the sizeof the referneced structure.
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 * proc is the routine to handle the referenced structure.
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 */
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bool_t
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xdr_reference(xdrs, pp, size, proc)
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        register XDR *xdrs;
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        caddr_t *pp;            /* the pointer to work on */
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        u_int size;             /* size of the object pointed to */
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        xdrproc_t proc;         /* xdr routine to handle the object */
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{
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        register caddr_t loc = *pp;
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        register bool_t stat;
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        if (loc == NULL)
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                switch (xdrs->x_op) {
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                case XDR_FREE:
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                        return (TRUE);
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                case XDR_DECODE:
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                        *pp = loc = (caddr_t) mem_alloc(size);
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                        if (loc == NULL) {
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                                (void) fprintf(stderr,
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                                    "xdr_reference: out of memory\n");
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                                return (FALSE);
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                        }
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                        memset(loc, 0, (int)size);
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                        break;
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                case XDR_ENCODE:  /* to avoid warning */
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                        break;
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        }
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        stat = (*proc)(xdrs, loc, LASTUNSIGNED);
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        if (xdrs->x_op == XDR_FREE) {
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                mem_free(loc, size);
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                *pp = NULL;
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        }
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        return (stat);
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}
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/*
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 * xdr_pointer():
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 *
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 * XDR a pointer to a possibly recursive data structure. This
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 * differs with xdr_reference in that it can serialize/deserialiaze
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 * trees correctly.
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 *
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 *  What's sent is actually a union:
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 *
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 *  union object_pointer switch (boolean b) {
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 *  case TRUE: object_data data;
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 *  case FALSE: void nothing;
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 *  }
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 *
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 * > objpp: Pointer to the pointer to the object.
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 * > obj_size: size of the object.
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 * > xdr_obj: routine to XDR an object.
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 *
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 */
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bool_t
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xdr_pointer(xdrs,objpp,obj_size,xdr_obj)
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        register XDR *xdrs;
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        char **objpp;
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        u_int obj_size;
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        xdrproc_t xdr_obj;
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{
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        bool_t more_data;
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        more_data = (*objpp != NULL);
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        if (! xdr_bool(xdrs,&more_data)) {
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                return (FALSE);
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        }
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        if (! more_data) {
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                *objpp = NULL;
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                return (TRUE);
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        }
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        return (xdr_reference(xdrs,objpp,obj_size,xdr_obj));
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}

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